Golang Plot.Transforms方法代码示例

// Plot implements the plot.Plotter interface.
func (b *BarChart) Plot(da plot.DrawArea, plt *plot.Plot) {
	trX, trY := plt.Transforms(&da)

	for i, ht := range b.Values {
		x := b.XMin + float64(i)
		xmin := trX(float64(x))
		if !da.ContainsX(xmin) {
			continue
		}
		xmin = xmin - b.Width/2 + b.Offset
		xmax := xmin + b.Width
		bottom := b.stackedOn.BarHeight(i)
		ymin := trY(bottom)
		ymax := trY(bottom + ht)

		pts := []plot.Point{
			{xmin, ymin},
			{xmin, ymax},
			{xmax, ymax},
			{xmax, ymin},
		}
		poly := da.ClipPolygonY(pts)
		da.FillPolygon(b.Color, poly)

		pts = append(pts, plot.Point{xmin, ymin})
		outline := da.ClipLinesY(pts)
		da.StrokeLines(b.LineStyle, outline...)
	}
}

// Plot implements the plot.Plotter interface.
func (g *Grid) Plot(da plot.DrawArea, plt *plot.Plot) {
	trX, trY := plt.Transforms(&da)

	if g.Vertical.Color == nil {
		goto horiz
	}
	for _, tk := range plt.X.Tick.Marker(plt.X.Min, plt.X.Max) {
		if tk.IsMinor() {
			continue
		}
		x := trX(tk.Value)
		da.StrokeLine2(g.Vertical, x, da.Min.Y, x, da.Min.Y+da.Size.Y)
	}

horiz:
	if g.Horizontal.Color == nil {
		return
	}
	for _, tk := range plt.Y.Tick.Marker(plt.Y.Min, plt.Y.Max) {
		if tk.IsMinor() {
			continue
		}
		y := trY(tk.Value)
		da.StrokeLine2(g.Horizontal, da.Min.X, y, da.Min.X+da.Size.X, y)
	}
}

// Plot draws the Line, implementing the plot.Plotter
// interface.
func (pts *Line) Plot(da plot.DrawArea, plt *plot.Plot) {
	trX, trY := plt.Transforms(&da)
	ps := make([]plot.Point, len(pts.XYs))
	for i, p := range pts.XYs {
		ps[i].X = trX(p.X)
		ps[i].Y = trY(p.Y)
	}
	da.StrokeLines(pts.LineStyle, da.ClipLinesXY(ps)...)
}

// Plot implements the Plotter interface, drawing a line
// that connects each point in the Line.
func (f *Function) Plot(da plot.DrawArea, p *plot.Plot) {
	trX, trY := p.Transforms(&da)

	d := (p.X.Max - p.X.Min) / float64(f.Samples-1)
	line := make([]plot.Point, f.Samples)
	for i := range line {
		x := p.X.Min + float64(i)*d
		line[i].X = trX(x)
		line[i].Y = trY(f.F(x))
	}
	da.StrokeLines(f.LineStyle, da.ClipLinesXY(line)...)
}

// Plot implements the Plotter interface, drawing labels.
func (l *Labels) Plot(da plot.DrawArea, p *plot.Plot) {
	trX, trY := p.Transforms(&da)
	for i, label := range l.Labels {
		x := trX(l.XYs[i].X)
		y := trY(l.XYs[i].Y)
		if !da.Contains(plot.Point{x, y}) {
			continue
		}
		x += l.XOffset
		y += l.YOffset
		da.FillText(l.TextStyle, x, y, l.XAlign, l.YAlign, label)
	}
}

// Plot implements the Plotter interface, drawing labels.
func (e *YErrorBars) Plot(da plot.DrawArea, p *plot.Plot) {
	trX, trY := p.Transforms(&da)
	for i, err := range e.YErrors {
		x := trX(e.XYs[i].X)
		ylow := trY(e.XYs[i].Y - err.Low)
		yhigh := trY(e.XYs[i].Y + err.High)

		bar := da.ClipLinesY([]plot.Point{{x, ylow}, {x, yhigh}})
		da.StrokeLines(e.LineStyle, bar...)
		e.drawCap(&da, x, ylow)
		e.drawCap(&da, x, yhigh)
	}
}

// Plot implements the Plotter interface, drawing a line
// that connects each point in the Line.
func (h *Histogram) Plot(da plot.DrawArea, p *plot.Plot) {
	trX, trY := p.Transforms(&da)

	for _, bin := range h.Bins {
		pts := []plot.Point{
			{trX(bin.Min), trY(0)},
			{trX(bin.Max), trY(0)},
			{trX(bin.Max), trY(bin.Weight)},
			{trX(bin.Min), trY(bin.Weight)},
		}
		if h.FillColor != nil {
			da.FillPolygon(h.FillColor, da.ClipPolygonXY(pts))
		}
		pts = append(pts, plot.Point{trX(bin.Min), trY(0)})
		da.StrokeLines(h.LineStyle, da.ClipLinesXY(pts)...)
	}
}

func (b HorizBoxPlot) Plot(da plot.DrawArea, plt *plot.Plot) {
	trX, trY := plt.Transforms(&da)
	y := trY(b.Location)
	if !da.ContainsY(y) {
		return
	}

	med := trX(b.Median)
	q1 := trX(b.Quartile1)
	q3 := trX(b.Quartile3)
	aLow := trX(b.AdjLow)
	aHigh := trX(b.AdjHigh)

	box := da.ClipLinesX([]plot.Point{
		{q1, y - b.Width/2},
		{q3, y - b.Width/2},
		{q3, y + b.Width/2},
		{q1, y + b.Width/2},
		{q1, y - b.Width/2 - b.BoxStyle.Width/2},
	})
	da.StrokeLines(b.BoxStyle, box...)

	medLine := da.ClipLinesX([]plot.Point{
		{med, y - b.Width/2},
		{med, y + b.Width/2},
	})
	da.StrokeLines(b.MedianStyle, medLine...)

	cap := b.CapWidth / 2
	whisks := da.ClipLinesX([]plot.Point{{q3, y}, {aHigh, y}},
		[]plot.Point{{aHigh, y - cap}, {aHigh, y + cap}},
		[]plot.Point{{q1, y}, {aLow, y}},
		[]plot.Point{{aLow, y - cap}, {aLow, y + cap}})
	da.StrokeLines(b.WhiskerStyle, whisks...)

	for _, out := range b.Outside {
		x := trX(b.Value(out))
		da.DrawGlyph(b.GlyphStyle, plot.Point{x, y})
	}
}

// Plot implements the Plot method of the plot.Plotter interface.
func (bs *Bubbles) Plot(da plot.DrawArea, plt *plot.Plot) {
	trX, trY := plt.Transforms(&da)

	da.SetColor(bs.Color)

	for _, d := range bs.XYZs {
		x := trX(d.X)
		y := trY(d.Y)
		if !da.Contains(plot.Point{x, y}) {
			continue
		}

		rad := bs.radius(d.Z)

		// draw a circle centered at x, y
		var p vg.Path
		p.Move(x+rad, y)
		p.Arc(x, y, rad, 0, 2*math.Pi)
		p.Close()
		da.Fill(p)
	}
}

// Plot draws the Scatter, implementing the plot.Plotter
// interface.
func (pts *Scatter) Plot(da plot.DrawArea, plt *plot.Plot) {
	trX, trY := plt.Transforms(&da)
	for _, p := range pts.XYs {
		da.DrawGlyph(pts.GlyphStyle, plot.Point{trX(p.X), trY(p.Y)})
	}
}